Pipe-bending core



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J. H. WINGATE & J. L. MELL. PIPE BENDINGQORB. No. 425,395. Patented Apr. 8, .1890.

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UNITED STATES PATENT OFFICE.

JOHN H. WVINGATE AND JOHN L. MELL, OF ATLANTA, GEORGIA.

PIPE-BEN DING CORE.

SPECIFICATION forming part of Letters Patent No. 425,395, dated April 8, 1890.

Application filed November 18, 1889. Serial No. 330,806. (No model.)

To aZZ whom ii may concern.-

Be it known. that we, JOHN H. \VINGATE and JOHN L. MELL, citizens of the United States, and residents of Atlanta, in the county of Fulton and State of Georgia, have invented certain new and useful Improvements in Pipe- Bending Cores; and we hereby declare the following to .be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to leters of reference marked thereon, which form a part of this specification.

The object of this invention is to overcome the difficultiesheretofore experienced in bending lead and other soft pipe. The appliances heretofore used for this purpose have either been inconvenient or produced bad results. To overcome their defects we have made the invention hereinafter described,which is fully illustrated in the accompanying drawings, in which Figure l is a sectional view of a pipe, in which is an elastic plug, and also showing the means by which the plug is removed. Fig. 2

is a section on line mm, Fig. 3, and Fig. 3 is a section on line I 3 Fig. 2, showing the construction and attachment of the metal end of the plug. Fig. 4is a viewof a portion of elastic plug, showing the metal end.

In the figures like reference-marks indicate corresponding parts in the several views.

A is an elastic plug, preferably of vulcanized rubber, and of a size that will fill the pipe to be bent. It is obviously necessary to have a variety of sizes of these plugs corresponding in diameter with the inside diameter of the different sizes of pipe. The most convenient length for medium sizes will be found to be about two feet, but the length in all cases must be as great as the bent portion of the pipe that isbeing operated upon. A length of pipe that is greater than the length of the plug may, however, be bent by inserting the plug from both ways or by drawing it back after a portion has been bent.

To one end of the plug A is attached a metal part B, that consists of the flanges b, that fit in corresponding seats in the sides of the clastic plug, as shown in Figs. 2 and 3, and the central extension I), that isthreaded to receive the rod C. The rod 0 should be of such a length as will reach in from the end of the pipe and screw into the extension I). The bolt 1) passes through the plug A and the flanges b, as shown in Figs. 2 and 3.

The advantages of this device over others heretofore used are, first, that its resistance to bending is very slight; second, that its resistance to the. crushing tendency of the pipe is very great and that the resistance is uniform over the whole length of the bend, and, finally, that the elongation of the plug by the pulling strain in Withdrawing it will reduce its diameter in proportion to the resistance and make its removal easy from even a very short bend.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent of the United States, is-

1. In apipe-bending core, the core A, of vulcanized rubber, having suitable means for withdrawal, substantially as shown and described.

2. In a pipe-bendin g core, the core A, of rubber, having the coupling B adapted to have attached thereto a hook or rod for withdraw ing the core, substantially as shown and described, and for the purpose specified.

In testimony whereof we hereunto afiix our signatures in presence of two witnesses.

JOHN H. WINGATE. JOHN L. MELL. itnesses:

A. P. Wool), J. J. SULLIVAN. 

